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Hourly Forecast
Daylight Hours
06:58
Sunrise
19:09
Sunset
Moon
Waxing Crescent
12:46
Moonrise
21:29
Moonset
Daily Forecast
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Air Quality Data Available
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UV Index
Humidity
Weather in Half Moon Bay today, September 16, 2026
Cloud cover dominates in Half Moon Bay on September 16, 2026, keeping sunshine limited. Expect a grey, overcast feel rather than long bright spells. Cloud leads the morning, peaking close to 100% near 06:00. Sunshine has little room until later in the day.
The day peaks near 17°C and cools toward 15°C. Relative humidity sits between 81% and 96%, reaching its peak around 22:00. Airflow remains manageable, reaching about 4.0 km/h around 17:00.
Afternoon skies stay clogged, peaking close to 100% near 12:00. The grey theme continues rather than clearing out. Visibility holds near 14.1 km, though it can fall to 12.2 km. Expect sunrise at 06:58, sunset at 19:09, and 12 hours 11 minutes of sunlight today overall.
Taken together, overcast skies in Half Moon Bay on September 16, 2026 favour indoor or covered options, with temperatures near 17°C.
Frequently asked questions about weather in Half Moon Bay
How warm does it get in Half Moon Bay?
The warmest month in Half Moon Bay is September, with average high temperatures of 19°C. The average temperature during this period is around 16°C.
How cold does it get in Half Moon Bay?
The coldest month in Half Moon Bay is February, with average low temperatures of 9°C. The average temperature during this period is around 11°C.
What is the wettest time of year in Half Moon Bay?
The wettest month in Half Moon Bay is January, with an average of 113mm of precipitation.
What is the driest time of year in Half Moon Bay?
The driest month in Half Moon Bay is July, with an average of 1mm of precipitation.
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